Star World 1 Secret Exit Walkthrough - Super Mario World 100% Walkthrough
For the regular exit see the video linked below.
You must be big Mario to reach the secret exit and fortunately there is a Mushroom at the start of the level.
Drop down onto the yellow blocks and go all of the way to the right. Spin jump through the first group of yellow blocks and continue through the 2nd group, still along the right wall, and you'll eventually reach the key and keyhole.
Regular Exit: https://youtu.be/S_vEI-ogDUo
Super Mario World 100% Walkthrough Playlist: https://youtube.com/playlist?list=PLWdUn5TiM4AnmbcVfEnM258NfYQziI8w5
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